Which of the following statements offers a partial justification for why the studios developed the "invisible style"?

A) in competing with foreign industries, the Hollywood industry naturally flocked to the superior mode of storytelling
B) demanding continuity helped ensure production efficiency, since directors had a pre-determined set of "rules" to follow
C) studios polled audiences as they exited the theaters to see what they liked
D) studios couldn't afford to build elaborate sets or choreograph complicated camera movements like their German and French competition could

B